Mime-Version:	1.0
To:	halite AT medison DOT co DOT kr (SangGyu Nam), djgpp AT delorie DOT com
From:	Nate Eldredge <nate AT cartsys DOT com>
Subject:	Re: How can I calculate the amount of free memory?
Date:	Mon, 20 Apr 1998 18:11:26 -0700
Message-ID:	<19980421011110.AAE9311@ppp124.cartsys.com>

At 10:33  4/20/1998 +0900, SangGyu Nam wrote:
>Hello.
>
>I'm making an image handling program using DPMI.
>The program displays some images such as BMP, JPG...
>Whenever an image displayed, I traced the free amount of
>free memory by using DPMI function 0x0500.
>The function returns correct value when I allocate memory
>but after free it, I could not get valid information.
>Only the amount before free() was returned.
>
>Someone said, because it's the property of runtime library.
>In other words, free() does not return memory to DPMI
>automatically. So if I want to get correct information,
>must use any function such as _heapshrink().
>The function returns all freed memory to DPMI.

But DJGPP has no such function. Currently, there is no way to return freed
memory to the DPMI server.

>But it did not work. I could not get yet.
>
>How can I get the realtime free amount of DPMI memory?

In brief: You can't. There may be a function added in the future to figure
out how much memory `malloc' is sitting on, but currently there is not.

If you are trying to debug a memory leak, there are a variety of packages
which wrap `malloc' and `free', and will keep track of this for you. MSS is
one such.

Nate Eldredge
nate AT cartsys DOT com

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